Lack of Interest [Suggestion] BB Code Media Sites

To get the best performance possible for video playback, it's best to use dimensions that can be divided by 16 ... like 512px x 288px for the video content.
Finally add player bar vertical dimension if necessary (like 25px for Youtube).

Reason:
Video Encoding is done in blocks of 8 or 16px, depending on the codec used. Decoding is much faster when the target display size fits into this 8 or 16px raster, so the decoder doesn't have to unnecessarily re-scale the video image.

I have just suggested a size that is close to the default (to make it the new default because of the reasons I mentioned).
You can of course make them much bigger or smaller, as you like. My explanation regarding the 16px raster still applies.